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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bf6b96342f5ae9b14e9b6dd4c971dea2d162350acb7ed2aaaa50cbf7d4a9e84' 
  AND token = 'hHON9ah1W6NneVeiDJ1Z5S4NGBLwQC+xBtyOmkJJhvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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