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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ef8eff1a05ad0e74f389388a129f8df369d97d91dce1a4744a294fb86bd4fe7' 
  AND token = 'cZ0jpwsXC9UMjf9ewQ1d8cRRs60j1JUsqARNPbMv4Wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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