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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97c716fcdec43e8cef93ab196116d18ca925be529df5a3d8b078c533cc1fda39' 
  AND token = 'SiswTO2s0nQFRNAGEMTFkyKTiV6ix0c6mGCiAv7MY7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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