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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '095eb29e8aeaf83d6101c0cd584716186fc97a4b29d728727d4c22a27b724739' 
  AND token = 'wRXpnITajjPGOnmE95sTAhwtVxX27fdhYdnXERXq4uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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