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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a507075f2a74cc1a0cd844e7c22a923f5a7eec89f8442d4fe2ad94a8f90a6fa' 
  AND token = '5sbaVCv0e8ZO/+4DhsST3dopqCjH6GtcmanpJRjtVwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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