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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c58fa3d3ecbc48321b544665f377fb6709746f88577943d84d7c5aab824480c' 
  AND token = 'A6+tmi/n82/bmlLG9UHed660hFqNVUyKot5b+Sf2x68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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