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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d886f01b7e516a8c5bc1f0f4533e26c2c57229501b203f3c8de1281f3b67f96' 
  AND token = 'Xt9mA+Yx9zGLtcU/Fs43Gf3JOD2/+cUSRMjkiRS9Ng8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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