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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d6c0cf3d9dde7b979679532aff430bf460768aa485cc65e3970c357a1e82402' 
  AND token = 'URcwx33JNAkhLzm0ZPvZmm3u8lH6c0cJDL4+FJ1Y+uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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