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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5ec18500470bf29b1f6b1782ed1cf3a842ee337e44abf466770edd3d2e029a2' 
  AND token = 'g6UPVopArOhvg5FkdLItL9CPAIV85DE8wjV5dMpMaiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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