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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04944ef61ce96e6ad05793a17981caa293f207cd999687ad69acaf2db9cd96b1' 
  AND token = 'ayPIofNEHJM67Gu4ysIttVBgRXhVdtBSBl2Cq1kynNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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