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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6ef6fe142aa508a97dc1d4ce2c9370120cd49c294ad0cd0392f28b05a65664f' 
  AND token = 'WI0WzWH6gDTC0dGa/3liy1KbLbbS4J1Krslzc4+3eME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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