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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '284feab050fb276b96d9fb6e834646e0f928a6c03a44ea95d3a2088c81f6e0d1' 
  AND token = 'JJVxluP3a2It1w018QjIDTWiW5oIKKYj8kc9eXqdHKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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