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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5a1b7744c053e9bab40a7adf51f9b2e67a5e18280fb37fd51602e5ebd03953d' 
  AND token = 'jkjvqSnvO1LhRYV9fMkmBps9X5vatUs3SGGDQ9tB3BM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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