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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f20500878012efd2e36643e7b6df50f91fe8c492cc6d52b767ba663742532db' 
  AND token = 'z65008Qd6iWoSs6HWP+QDQyBvpz12QqV9wKxpN0j31g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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