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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '939ce52bc9485c9278a62af510128a2adc2624de6d5ee17724d10dd9b80cb984' 
  AND token = 'B6ZRHP/F1gr+O4NmAmG3a16zFJCcNT35SsKOSTcrzp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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