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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cec76bd388b80b08956662d3cff316a000aab75363dd79613ac38f3bc88e5798' 
  AND token = 'y4UlFj9ZpEbZ4ey+LvG3I78ScwzsX/F0KPyYy43LuTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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