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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c19cd124331dd721f05fcdb077526b461aec43aa8aa9bdc05b451b7c3d93c68b' 
  AND token = 'KYJUWXs3az3h04IYZqAKXtLsuvuk9o/kI942+dgK26s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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