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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dcc3983c499a41e9432470f5caa6388cf7ac942faafc5237c9f722cb59ae884' 
  AND token = 'beT01hy0/1DvezD1sv77YpHD6gZT+EAyWFyEPr4rExU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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