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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9da8baf4772a4841983b67b95c7906b014ac8d324f0fed6e6fd4f8b52445f7dd' 
  AND token = '/osNoQmnQ0AS3bdLnn7dYmgGpRAKHaKBWi4TahYwgrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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