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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18ae075ee3d5c630260eccda90e32e99790ebe05bb6c1329d96b7fc0584f2938' 
  AND token = '+eRNFzLBEcamWBmG55lGd0nDLBQg4HUqTGeiTiv1smc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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