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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e43acdccbb8153be0e92af6096e824ffcbcb413ea5a218ce6ce3d8578d62864a' 
  AND token = 'eraLp4f3J5CUv/zDCvHRXyILVzYlU/KNPP5Knzx4S1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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