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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54c23ab2ab326a66b97b4a6033128352c8bd6477cc62c262934344a6eabed2f9' 
  AND token = 'TvgjV9nGbcgv3Yt68vlgN30eUBcMB4vHQq6ToSHDfkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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