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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab49b923bbc0c3e3aada78f18c9519acb2044fec4b4c74eaa9b00d071b06576c' 
  AND token = 'RxTi1WfBUCvONqrIK0hf085Q+Lj50jTvjdgB6dfvIiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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