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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df96caead6610854f2eed2760fd86d83fc51a515c89caa1b0efaec2d4934fd7d' 
  AND token = 'qlP9DH1+J/dv0Y7Do+TehzilbKZUV/m2N0Xk6E51o2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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