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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82101d52ff6a7905c7d5a1d03580e3b51536cac6a9220ba873571152daaac51c' 
  AND token = 'e5RtRTkDKEZCaxAmANDc6QRozz6hSB7F4vKjg163/NU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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