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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77c8056abf1e0e5a399689ccf8494022759d0ec95fd8c5278585af1749b299ff' 
  AND token = '3NfkrhjYzo0HB0QbgB3U4ITlGEQaNkABcW9XYU1G05g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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