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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f9a10658322485cdde0493da57538f0141fd45c745bd55c8429ce1e1556e866' 
  AND token = 'vSD/ycPj/XkN77wHPEU7mK+qTksj540e3QUu2gEud5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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