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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e02aa4ba48278866e2ae61193e2299c67b1afb12ed8c5d01bc494d190d598734' 
  AND token = 'fMr6rypEMh1XfDQ3iqRvTH/ug6kB9mOYU/nzzQfOMSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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