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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19908e91e56814646871f6c923135aaff27331a562b234160aa80aae14d0b008' 
  AND token = 'P19B01KTWJXTgqHV6pTN2pI4g0nX+6vAT507lBMSZoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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