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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4350dce9920bb8d0e3cdd888a1a9b5c7ede3d20ec09593e476e288e13ec16261' 
  AND token = 'UT+GTUIeMdCUb7ZiHGpq1MAuisxJGrMWSFsx/wiXX9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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