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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a19dea8d066082dbb580fc652bbc4b831c2b7c720de5ab436d00a2010af9b09' 
  AND token = 'eDzhujBDNXQ7oxgB9D6qQF33M2M2RAssZ/yBrqAYzEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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