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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5686cf36c7e9e36d2ce76ec484348a7742ac020a6b2923fe846aa92381e50ccb' 
  AND token = 'hy+vdvWiQ+6m/7Cg2xPfhmhFXoSTW7p4npbsB/JQ1QQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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