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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69dc9dcdc327595aec5d45d8b9571baab46ebae7a0642f52938cfea6f27a577a' 
  AND token = 'oaMvPYetcSi1MBoy7ZcHxO3q+HsDFd6Mnr3rH8H/bEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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