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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddf5a3a757192e1efe0537aca69d63be1639c897cfb950be5f5554d4aae20e62' 
  AND token = 'S4VPR47nxfk3zoHgjgE5ol1dabyCIvSMtNmCeHyxRpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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