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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b3f051c4b9b0b56849472a15d41c44e87edbb8c3f632c6a44eacab9d74f4776' 
  AND token = 'RhgXlA7iGqI4erZtmlmRzbId58Jf+J3D4jK5QllPUDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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