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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03ce867d7e62a6da430ed9d4470c8f80c8f5a9177e7c92da87dc06c8f226c3f4' 
  AND token = 'C+wrTCgtNfgbEyTuaYRs1dPH68KfEGwpQ2Si9YIQC/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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