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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b341806f929be72b3c3644c0e944e1c189c73663ba8b7e6526b0688b1e82910d' 
  AND token = '0nx38UAil9nkeu/FxpVymp3iizdwPEpTo3K8Sfid/Jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00089

JSON explain

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