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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1f7799878dc84e949d16fec94da55dfe287f2ae9d3dde35388f6d34dbfd8576' 
  AND token = 'DQ8doUYTWpW5OdQhtNvmmwC57QjN9Q9WVj6Yk1rh9Rs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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