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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10585d16120a481f43abce18066f2243e0a2516a7ca963a07da6f8c22f02cb80' 
  AND token = 'jCAlMQvg84ZRcQQPWqc366kl+tGb+YlV6A/+eBwPjAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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