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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dd7a56903e37a51ea3e5653ec443a3292c46a769c57d7b1445e4d4d399f1578' 
  AND token = 'gPAtjoaD8OEGTerRJPRXiLOIJUlPj8Prtrhc3HiH95Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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