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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b928ba41ae52edae5fe0f339d0b7bbbb31fd5889aef7d7812d9fe6264f3114a1' 
  AND token = 'zqcERcUgZQcGj6l/4SeBU2wf30VZW42jfliIi3OlTYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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