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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '696a6ee3e39b37ab79d2b800618b05fb0621a4f5d81ecac5cdb16da613947ead' 
  AND token = 'dUC8UqfxT2Rtbd9A9dYbjYncguHRwmeFP8oh46YZM2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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