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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8695602c2d1d8c4124f4754e588b914ab765250bd28e11257aed5bdea49e5e3e' 
  AND token = 'uAlqKiFxScY0epU+m+eNG1bRuxUcnLx6k/fLtDRreS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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