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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6c182a93e65f4071267eab9225623fabd2269def6be051b80ef699fe1df1e93' 
  AND token = 'aJfj09pij8jecCidJT/gNbOPlvX4qWq7hsfHvzNhv6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}