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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4892b0f67e18798725b7ba8d5d55258dd4f28a740573fb3e4a3ea94e8fbc16e5' 
  AND token = 't99+9T4UcY3P3SfoNgpJDNEUys6qz5sZQ5NS9Rs46II=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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