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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82df50198b9f7999ef8709620d94b245dac3105e90ed20b08d27c2d59c498ad4' 
  AND token = '8wX4LJpGFhgPxkYZupumccFH331E8ZHBCbaAZggYZWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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