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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47d71ed18e21261e2242978e9c398f522edcf2f8413d7e0825b84dd1747d672b' 
  AND token = 'yo5cfcoGOy+NR9Gihl1nHPDnFNR7HKnEJ4GAbB9iP8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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