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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73e66929d18e2180f9bb7c7319b31822569b41997d1f0bc77452f0c263712c62' 
  AND token = 'H8HGqRas71nGDTqAJ0nrjV7sfJ9Z+AckKt3ZVpfon54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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