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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5882c1914350eb8d8df99394e1e6567d5cff50855ba111a2a61026e8796a519' 
  AND token = 'OqRDbprCX9nxNGCkPx61DpkQmgyM0ES47/zEapIaF3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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