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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07f8890222e03f3d39513b26b094384ee17f734fdb9146a8f24af4b691d366e9' 
  AND token = 'eidL4cXChzBRvgnM3emyrM9SEs7MTbSzVbw8p6203XE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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