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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34cc895afd197c9e648ca982e308b3710c39ff6ec0c057b45ef59bc90d424963' 
  AND token = 'JeBDPagGcgZ9G4u217UUG5AictSDlXW+tGP5xvy4NpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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