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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb994bc05588a2667cd81945f461b5f06f9ea99319a86fc997f0ba841b7879bb' 
  AND token = '2ae/LUtFuWz0tK3HHZfv+xPysrfhX+qWINQTvx3aUAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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