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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '825653f4537c693165ef284cb9562e4900ef31d80c2d5f6b68b5d735f5e75fff' 
  AND token = 'F36HaQjFPcnG7k6FYDNSjQtS7+BjTA4oSyZpopxyaQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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