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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f676e28ba10ca2713e36ada8d2bbf99da5ddf042a52ad0d1f13b3d0467a3126d' 
  AND token = '3UE1katsMUXXrFt+nIxcAjjacT0RHHVi5dQ/P3w/qzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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