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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0755848020b596004e393adc2516f49abe1ee4fe7fbf65f94c6e687a25118cd8' 
  AND token = '+JV1L5J73ZEyWIJe3lz+6EQrwDunmmO1G2r2w0OO8GM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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