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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83be6d46844a3a5872c87971230620c8672406d0edf565358e693f2652f41ea8' 
  AND token = 'm0sSkM3E3886ukefvO6Jhd3hw+9FvMZhof/0BEpCTeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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