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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be41b051e63f37cf062b7ded47eef4f90804c1f75dee1f7f79884363c13c0961' 
  AND token = 'bszkMcfQSArBabFFx8XoFqme1PftlTAwws2rbpKPIUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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