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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe64deb45d64bd819ce4e7c072c700178e1fe8e748d785de04cc386a1828baa2' 
  AND token = 'F7uwAgECk3Db/Y/Jm9nXajZW3Fup0P9urKPQJR4kT2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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