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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61d331d749965e3e81be7dacb4da6873747600d809ee7d4ecd361712d284f0bd' 
  AND token = 'r5np2Ti3MlKnPj9q2btio/VXo6V1oIhayhWQ+KHYFHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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