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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '917d073b81c15cbdb3d1ff329ef9a46f408e3e62c7de57a3f457cb9df4c4b9e8' 
  AND token = 'gEjXega8o7VsC2CEFo+KaY9PpYpqg2e6I65wM0Nuo6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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