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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89ca6494554b6a1150fc8511047ee8af5d729ba8ab4c99b406048d885c18c997' 
  AND token = '4Ofb/1Xq0A29yYUTgOuvoMPhFXhM79FHa2/aj6j+4fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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