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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26aad73bb2a51c7a170ec4247d3e4b5d89277656fcff13340b94e12b39146357' 
  AND token = 'bHPB5MxFPc2BhaXdxQnhXXonChZkRJmRo9LufJvF3PY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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