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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a85c96a624e7e106e69f98d3fd2345681fafebdbe14f50f5b117a01a68ccfaa' 
  AND token = 'cwA0MBVqab9xDMa3tMpEbNasged0j/qfqmv8KGiAhPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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