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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ca62d2f5b7fae6a90d9ad9d27d3b5e4f650bd9cc99198fb9bbf43447a2f2d39' 
  AND token = 'CHIttijx2Dra19mQ2f+XzmUAs0qWggiOQTz0hMDmPdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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