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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '456840c277f3893d846742dcdea2272f3a56748fdc54199de87cad91736d60cb' 
  AND token = 'qWGj4hEckS2jS3v/DxpxgB5lLFEOO4XnyF7xQEVQQTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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