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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe01ac0b6412a838d71f5064e27d1e1d6acc1e07824d1d538cbe9ae21e16c1de' 
  AND token = 'teeKxLgcb9eCHU6DDYwS4ATePlIqsnGUNIfPPzl6ALQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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