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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c13fd90b2544bd1cb52de61e0572b569b4a900578528ada4ffb43921a3c2145' 
  AND token = 'A67Vu1IG4QKLIM4MyGg5LCeB/kM6yLIBxChS0ZS+MZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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