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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '707842b1642c14783673f3816e9108aca8c50c4cbaf75fe1a2647bfe3ee59838' 
  AND token = 'nGGGsi6gIk9M0R1EPceQjB8iiMeeqzwa6bSjdSWHnuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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