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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfa5fc99ee800bdcc3cf55f020b8a0c26fac0fbb8e5df9b45b6019d7d9ee5e83' 
  AND token = '89eOz4Yr40Ini173JnwMt8VlkTWdtQeDlOmnzxKTCj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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